Moving to custom dropdown tag: feature check, not fully finished
Fixing custom element feature detection
Moving initialize code out of event handler
Moving custom tag stuff into branch
Updating to use browserify
Adding a min-width to dropdowns
Fixing require statements
Updating CSS paths
Re-adding custom tag stuff
Renaming shadow class name / utility variable
Implementing common ShadowTemplate and child ShadowDropdown
Implementing ShadowButton
Removing non-custom tag stuff since Chrome caught up
Removing extra console.log
Merge remote-tracking branch 'origin/custom-tags'